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Cinco de Mayo is not, as many Americans assume, Mexico’s Independence Day. It’s not even an important holiday south of the border. Instead, its modern roots can be traced to Mexican-Americans in the 1960s and the opportunism of wily beer distributors.
Something like social contracts likely run deep in our nature. As does the “economic justice” they need. The largest database we have on hunter-gatherer cultures suggests our ancestors had rigidly egalitarian tendencies 10,000 generations ago.